Header linked list bug fix#7

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bferg wants to merge 6 commits intojmimo:masterfrom

Commits on Dec 19, 2012

Fixed bug in IcapHeaders.removeHeader where removing the last header messed up the head reference
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Patch for ReadIcapHeaderState to accommodate malformed ICAP error messages
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Commits on Jan 17, 2013

Fixed spelling in chunk toString methods
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Commits on Feb 16, 2013

Reset initial decoding state when initial line does not parse
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Commits on Mar 5, 2013

Unset preview header on early terminated previews (simplified version of GlobalVelocity/netty-icap@5dbd9923e59bb0d5bc86424a0be8af64fa881d7a)
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Commits on Mar 8, 2013

Fixed logic operator from bit-wise and to logical and
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